[文件操作] [已解决]根据文件夹中文件判断缺失情况对应输出？

<#*,:&cls
@echo off
cd /d "%~dp0"
powershell -C "Set-Location -LiteralPath ([Environment]::CurrentDirectory);. ([ScriptBlock]::Create((Get-Content -LiteralPath \"%~f0\" -ReadCount 0 | Out-String)))"
pause
exit /b
#>
$beginNumber = 1
Add-Type -TypeDefinition @'
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace MyCode
{
  public class ExplorerViewComparer : Comparer<string>
  {
    [DllImport("Shlwapi.dll", EntryPoint = "StrCmpLogical", CharSet = CharSet.Auto)]
    internal static extern int StrCmpLogical(string p1, string p2);
    
    public override int Compare(string x, string y)
    {
      return StrCmpLogical(x, y);
    }
  }
}
'@
$ExpComp = New-Object MyCode.ExplorerViewComparer
[system.collections.arraylist]$alfiles= @(Get-ChildItem -Path .\*_* | Where-Object { -not $_.PSIsContainer } | ForEach-Object { $_.Name })

[void]$alfiles.Sort($ExpComp)

$alfiles | Select-Object -Property @{
  Name       = 'prefix'
  Expression = {
    if ($_ -match '^([^_]*_+)(\d+)') {
      $script:m = $Matches
      $script:m[1]
    } else {
      $Script:m = $null
      ""
    }
  }
}, @{
  Name       = 'suffix'
  Expression = { if ($Script:m) { $Script:m[2] } }
}, @{
  Name       = 'number'
  Expression = { if ($Script:m) { $Script:m[2] -as [int] } }
} | Group-Object -Property prefix | ForEach-Object {
  if ($_.Name -ne "") {
    $arrnumbers = @($_.Group | ForEach-Object { $_.number })
    $numberLength = $_.Group[0].suffix.Length
    for ($i = $beginNumber; $i -le $arrnumbers[-1]; $i++) {
      if ($arrnumbers -notcontains $i) {
        $_.Name + $i.ToString().PadLeft($numberLength, '0')
      }
    }
  }
} | Set-Content -LiteralPath .\aaa.txt
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